I used to work in my DD's school's preschool. Birthdays are a big deal! There were 15 or so kids in the class. If their birthday was in the summer, we celebrated half birthdays instead. We had the kids all take turns bringing in snacks, so the birthday kid brought the snack that day. Some of the parents brought pizza/ice cream, one even had it catered. The birthday kid gets to pick their job first, pick the song to dance to, we'd sing to them before snack, etc. They had a birthday crown too. I liked that each kid got to feel special for a day. It helped a few kids come out of their shell too.